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Localization of sounds in physical space plays a very important role in multiple audio related disciplines, such as music, sound art or sound editing for audiovisual productions. The most well known technique for providing such spatial impression is stereo panning, which creates a virtual location of a sound source by distributing its energy between two independent channels during the mixing process. However, once all the sound events have been mixed, re-distributing source locations to widen the stereo image is not certainly an easy task. Motivated by this problem, we propose a source spatialization technique based on the time-frequency processing of the stereo mixture. The energy distribution over the stereo panorama is modified according to a non-linear warping function, providing a widening effect that enhances the stereo experience without degrading the sound quality and preserving the original conception of the mixing engineer.